John Torrey Collection of Letters, ANSP-Coll-0364, Box: 1; Box: 2; drawer: 19. Academy of Natural Sciences of Drexel University.
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John Torrey Collection of Letters, ANSP-Coll-0364, Box: 1; Box: 2; drawer: 19. Academy of Natural Sciences of Drexel University. https://archivalcollections.drexel.edu/repositories/3/resources/688 Accessed May 16, 2024.